{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/105255"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/105255","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Multispectral optical depth measurements in post-detonation high explosive fireballs","abstract":"Temporally and spectrally resolved optical depth measurements were made in post-detonation fireballs from five different high explosives. PETN, HMX-based PBXN-5, RDX, an 80% RDX/20% aluminum mixture, and PETN-based Primasheet 1000 explosives were detonated in a 2.18L explosive test chamber. Charges were 125mg or 250mg explosive output pellets, each detonated by an 80mg low density PETN initiating charge. The charge configurations were based on a modified RP-80 exploding bridgewire (EBW) detonator, which is manufactured by Teledyne RISI. Five laser wavelengths were studied which cover the visible through long-wave infrared region of the spectrum. These 405nm, 532nm, 650nm, 1310nm and 9600nm lasers were used to probe the post-detonation fireballs for the first 5ms after initiation. The two charge masses were studied to understand how optical depth scales with charge mass for the same confinement volume. Data for the optical depth and wavelength and explosive composition are presented and discussed. The spectral dependence on optical depth scaled approximately as λ^(-1), which departed from the expected λ^(-4) dependence from light scattering alone. This result suggests that there is significant broadband absorption of light, in addition to scattering, through the explosive fireball. The results of this study have important implications in the interpretation of optical data collected during explosive events, as well as in the design of future experiments. The penetration depth of light through an optically dense fireball scales with wavelength and is dependent on the explosive used. It can be concluded from the data presented herein what portion of the fireball one is measuring in emission for a given high explosive, wavelength, and also how that portion changes with charge mass in confined or unconfined blasts.","abstract_html":"Temporally and spectrally resolved optical depth measurements were made in post-detonation fireballs from five different high explosives. PETN, HMX-based PBXN-5, RDX, an 80% RDX/20% aluminum mixture, and PETN-based Primasheet 1000 explosives were detonated in a 2.18L explosive test chamber. Charges were 125mg or 250mg explosive output pellets, each detonated by an 80mg low density PETN initiating charge. The charge configurations were based on a modified RP-80 exploding bridgewire (EBW) detonator, which is manufactured by Teledyne RISI. Five laser wavelengths were studied which cover the visible through long-wave infrared region of the spectrum. These 405nm, 532nm, 650nm, 1310nm and 9600nm lasers were used to probe the post-detonation fireballs for the first 5ms after initiation. The two charge masses were studied to understand how optical depth scales with charge mass for the same confinement volume. Data for the optical depth and wavelength and explosive composition are presented and discussed. The spectral dependence on optical depth scaled approximately as λ^(-1), which departed from the expected λ^(-4) dependence from light scattering alone. This result suggests that there is significant broadband absorption of light, in addition to scattering, through the explosive fireball. The results of this study have important implications in the interpretation of optical data collected during explosive events, as well as in the design of future experiments. The penetration depth of light through an optically dense fireball scales with wavelength and is dependent on the explosive used. It can be concluded from the data presented herein what portion of the fireball one is measuring in emission for a given high explosive, wavelength, and also how that portion changes with charge mass in confined or unconfined blasts.","abstract_has_math":false,"creators":["Lodes, Rylie Patrick"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Glumac, Nick G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-08-23T20:48:24Z","date_published":"2019-08-23T20:48:24Z","updated_at":"2026-07-22T22:24:44Z","subjects":["Optical depth","Fireball","High explosive","Laser attenuation","Laser absorption","Laser scattering"],"languages":["en"],"rights":["Copyright 2019 Rylie Patrick Lodes"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/105255","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Glumac, Nick G."]},{"key":"dc:creator","label":"Author","values":["Lodes, Rylie Patrick"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-08-23T20:48:24Z","2021-08-24T09:15:28Z","2019-04-25","2019-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Optical depth","Fireball","High explosive","Laser attenuation","Laser absorption","Laser scattering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Rylie Patrick Lodes"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/105255"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Temporally and spectrally resolved optical depth measurements were made in post-detonation fireballs from five different high explosives. PETN, HMX-based PBXN-5, RDX, an 80% RDX/20% aluminum mixture, and PETN-based Primasheet 1000 explosives were detonated in a 2.18L explosive test chamber. Charges were 125mg or 250mg explosive output pellets, each detonated by an 80mg low density PETN initiating charge. The charge configurations were based on a modified RP-80 exploding bridgewire (EBW) detonator, which is manufactured by Teledyne RISI. Five laser wavelengths were studied which cover the visible through long-wave infrared region of the spectrum. These 405nm, 532nm, 650nm, 1310nm and 9600nm lasers were used to probe the post-detonation fireballs for the first 5ms after initiation. The two charge masses were studied to understand how optical depth scales with charge mass for the same confinement volume. Data for the optical depth and wavelength and explosive composition are presented and discussed. The spectral dependence on optical depth scaled approximately as λ^(-1), which departed from the expected λ^(-4) dependence from light scattering alone. This result suggests that there is significant broadband absorption of light, in addition to scattering, through the explosive fireball. The results of this study have important implications in the interpretation of optical data collected during explosive events, as well as in the design of future experiments. The penetration depth of light through an optically dense fireball scales with wavelength and is dependent on the explosive used. It can be concluded from the data presented herein what portion of the fireball one is measuring in emission for a given high explosive, wavelength, and also how that portion changes with charge mass in confined or unconfined blasts.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01","The student, Rylie Lodes, accepted the attached license on 2019-04-24 at 09:45.","The student, Rylie Lodes, submitted this Thesis for approval on 2019-04-24 at 11:05.","This Thesis was approved for publication on 2019-04-25 at 07:52.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13868 on 2019-08-22 at 16:23:46","Made available in DSpace on 2019-08-23T20:48:24Z (GMT). No. of bitstreams: 2 LODES-THESIS-2019.pdf: 2400076 bytes, checksum: 9ee8a906040d52de1d078865666d6d32 (MD5) LICENSE.txt: 4208 bytes, checksum: 20e249e374711949bb04cab9a7a97cb3 (MD5) Previous issue date: 2019-04-25","Embargo set by: Seth Robbins for item 112377 Lift date: 2021-08-23T20:48:32Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 112377 on 2021-08-24T09:15:28Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Multispectral optical depth measurements in post-detonation high explosive fireballs"]}]}],"canonical_facts":{"dc:contributor":["Glumac, Nick G."],"dc:creator":["Lodes, Rylie Patrick"],"dc:date":["2019-08-23T20:48:24Z","2021-08-24T09:15:28Z","2019-04-25","2019-05"],"dc:description":["Temporally and spectrally resolved optical depth measurements were made in post-detonation fireballs from five different high explosives. PETN, HMX-based PBXN-5, RDX, an 80% RDX/20% aluminum mixture, and PETN-based Primasheet 1000 explosives were detonated in a 2.18L explosive test chamber. Charges were 125mg or 250mg explosive output pellets, each detonated by an 80mg low density PETN initiating charge. The charge configurations were based on a modified RP-80 exploding bridgewire (EBW) detonator, which is manufactured by Teledyne RISI. Five laser wavelengths were studied which cover the visible through long-wave infrared region of the spectrum. These 405nm, 532nm, 650nm, 1310nm and 9600nm lasers were used to probe the post-detonation fireballs for the first 5ms after initiation. The two charge masses were studied to understand how optical depth scales with charge mass for the same confinement volume. Data for the optical depth and wavelength and explosive composition are presented and discussed. The spectral dependence on optical depth scaled approximately as λ^(-1), which departed from the expected λ^(-4) dependence from light scattering alone. This result suggests that there is significant broadband absorption of light, in addition to scattering, through the explosive fireball. The results of this study have important implications in the interpretation of optical data collected during explosive events, as well as in the design of future experiments. The penetration depth of light through an optically dense fireball scales with wavelength and is dependent on the explosive used. It can be concluded from the data presented herein what portion of the fireball one is measuring in emission for a given high explosive, wavelength, and also how that portion changes with charge mass in confined or unconfined blasts.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01","The student, Rylie Lodes, accepted the attached license on 2019-04-24 at 09:45.","The student, Rylie Lodes, submitted this Thesis for approval on 2019-04-24 at 11:05.","This Thesis was approved for publication on 2019-04-25 at 07:52.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13868 on 2019-08-22 at 16:23:46","Made available in DSpace on 2019-08-23T20:48:24Z (GMT). No. of bitstreams: 2 LODES-THESIS-2019.pdf: 2400076 bytes, checksum: 9ee8a906040d52de1d078865666d6d32 (MD5) LICENSE.txt: 4208 bytes, checksum: 20e249e374711949bb04cab9a7a97cb3 (MD5) Previous issue date: 2019-04-25","Embargo set by: Seth Robbins for item 112377 Lift date: 2021-08-23T20:48:32Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 112377 on 2021-08-24T09:15:28Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/105255"],"dc:language":["en"],"dc:rights":["Copyright 2019 Rylie Patrick Lodes"],"dc:subject":["Optical depth","Fireball","High explosive","Laser attenuation","Laser absorption","Laser scattering"],"dc:title":["Multispectral optical depth measurements in post-detonation high explosive fireballs"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:44Z"}